Example of a WPS service that reprojects a geoTIFF by using a EPSG code. THe example image is in EPSG:32119, lcc projection for north caroline and it comes from GRASS-GIS spearfish dataset. The image is reprojected into EPSG:4326 (lat/long):
Metadata: http://rsg.pml.ac.uk/wps/generic.cgi?request=describeProcess&service=wps&identifier=reprojectImage&version=1.0.0
Library: gdalwarp